Add the Lambda function to your group
definition

Next, you are going to add the Hello World Lambda function to your group definition.
After is is deployed locally, that function sends data back to the AWS IoT platform
and
shows you have a deployed a functioning core.

In the AWS IoT console, choose Greengrass, and then choose
Groups.

Select the tile for your group.

In the navigation pane, choose Lambdas, and then choose
Add your first Lambda.

Choose Use existing Lambda.

Select the Hello World Lambda function you created eariler, and then
choose Next.

Select the version of the Hello World Lambda function to use, and then
choose Finish.